Yes, we're sharing videos! 
Here is my video of purple ghosting with Firmware 1460.9
And one for the scanlines (FW 1460.9)
And 2 photos of non functional Local Dimming :
Movie Mode (LD High - CE Off)
Game Mode (LD High - CE Off)
But Samsung doesn't acknowledge any issue... and to be clear, this a set that has had its motherboard AND screen replaced!!!
My 65Q90T XXN (Belgium) model:
Technician comes on Friday, DSE (Dirty Screen Effect) disturbs me on the right from the center. The grid is much more visible than on other parts of the screen. What do you think?
I am in Belgium too, how did you manage to make them send a technician?
When I asked Samsung to do so, here is what happened to me :
1- they did a remote picture test via WhatsApp, didn't detect any issue, so they refused to send anyone
2- they did the same remote picture test via the phone support line, didn't detect any issue, so they refused to send anyone
3- after contacting them via Twitter, they agreed to send someone
4- the confirmation that the company responsible for technical support (Servilux) came from WhatsApp
5- Servilux contacted me the next day to get the information about my issues (Samsung didn't send them)
6- then nothing... when I called Servilux, they told they contacted Samsung and that it had been told to them that the tv had no issue
7- the repair file I can follow Online is stuck in "manufacturer calls the client"... which never happened of course
8- I went through my retailer (Fnac) which miraculously agreed to take back my tv to repair it (when I called back a few days later, they almost asked me to go through the closest store even though I bought the tv on the webstore)
9-Fnac took back the tv and sent it to Samsung
10- Samsung changed the screen and motherboard (and, as far as I know, never checked the issues, especially after the change)
11- the tv came back with the same issues
12- now Samsung is not answering my posts on @Samsungbelgique, nor on their WhatsApp account
13- Fnac is trying my patience by telling me repeatedly that the person that could do something in my case is either "not available" or "already gone", and that they will call me "first thing tomorrow", every day for 3 days now
So if you have a direct way to get a tech coming to your home, please tell me (even by private message if you want)!
So guys (and especially anyone experiencing ghosting on their set), I managed to get a document from the service company (wasn't that hard, I just had to wait 30 minutes on the phone and then ask for it) with Samsung confirming that everything was "normal" and "within specs" when faced with purple ghosting.
Here is what the document says (redacted for translation from Dutch to English and for preserving my privacy)
To better understand, here is the video I sent them for evidence :
Yep, everything "within specs is normal"...
So I guess Samsung is now officially saying that purple ghosting is perfectly part of the Q90T specs, I hope they update their tv's ads to include that.
Oh, and Samsung's reps have no idea what company swapped my tv's motherboard and screen, but it's not the one in the message, as they confirmed having never received a tv with mine's serial number.
Aaaaand my retailer doesn't agree to do any exchange, they want to take back the tv and send it to Samsung again for repair (what good can come from that if Samsung thinks everything's right with these issues).
Frustration is growing...
